On-machine visible dirt measurement on moving sheets and the relationships to standard laboratory methods

TAPPI Journal ◽  
2020 ◽  
Vol 19 (8) ◽  
pp. 413-417
Author(s):  
DAVID TREPANIER ◽  
ROLAND J. TREPANIER
Keyword(s):  
Laboratory Test ◽  
Laboratory Testing ◽  
Test Methods ◽  
Standard Laboratory ◽  
Laboratory Methods ◽  
Physical Size ◽  
Iso Standard ◽  
The Difference ◽  
Black Area ◽  
New Sensors

There has been a proliferation of new sensors to measure on-machine dirt specks that employ different technologies and methodologies to perform measurements. The differences in the on-machine technologies are discussed in terms of the TAPPI and ISO standard laboratory test methods with respect to dirt detection using light reflected from, or light transmitted through, the sheet. Also discussed are the requirements for measuring statistically representative areas of the sheet; the difference between the dirt physical size and Equivalent Black Area (EBA) size; and the implication of these issues when specifying cleanliness acceptance criteria. This technical brief describes on-machine visible dirt measurement’s relationship to standard laboratory testing.

Methods to Evaluate Cleaners and Sanitizers

1982 ◽  
Vol 45 (13) ◽  
pp. 1257-1260 ◽  
Author(s):  
DALE L. SCHEUSNER
Keyword(s):  
Test Methods ◽  
Test Method ◽  
Test Results ◽  
Standard Laboratory ◽  
Test Procedures ◽  
Laboratory Methods ◽  
Product Use ◽  
Cellulose Sponge ◽  
Equivalent Test ◽  
Recovery Methods

Methods to evaluate germicides can be grouped into three categories: standard laboratory tests, in-use tests and simulated-use tests. Standard laboratory methods, such as the Available Chlorine Germicidal Equivalent test, are specifically defined for reproducibility in any laboratory by any operator, but the test results often lack relevance to actual product-use conditions. In-use test methods are relevant to product-use; however, in-use test procedures do not permit proper controls to be included in the organism recovery methods. Contact plates give an estimate of organism numbers which is only 25% of the theoretical number of organisms present. Organism recovery using a swab, cellulose sponge or tube sampler give estimates of organisms ranging from 91 to 111% of theoretical. The tube sampler is a 1-in. length of flexible tubing having a 1-in. interior diameter and a smooth end, which can make a water-tight seal on a flat surface. Simulated use testing yields data which are relevant to actual product-use. A cafeteria tray is soiled, inoculated and cleaned in a manner to simulate actual product-use. This test method permits the necessary controls to be used. Tray-test reproducibility is as good as that of the other recovery methods tested and organism recovery is quantitative. The tray test provides a means for determining biological cleaning where the effect of both cleaning and germicidal activity are measured together.

scholarly journals Testing Antimicrobials Against Biofilm Bacteria

2002 ◽  
Vol 85 (2) ◽  
pp. 479-485 ◽  
Author(s):  
Martin Alva Hamilton
Keyword(s):  
Continuous Flow ◽  
Antimicrobial Agents ◽  
Diffusion Processes ◽  
Test Methods ◽  
Standard Test ◽  
Standard Laboratory ◽  
Test Apparatus ◽  
Laboratory Methods ◽  
Biofilm Bacteria ◽  
And Diffusion

Abstract Standard laboratory methods are needed to assess the efficacy of antimicrobial agents that are applied to biofilm bacteria. Existing standard suspension tests and dried surface tests show much greater efficacy than antimicrobial agents applied to biofilms. The greater resistance of biofilm bacteria to antimicrobial agents can be attributed to a number of interacting factors, including reaction and diffusion processes that limit an agent's accessibility to bacteria, phenotypic changes in biofilm bacteria caused by stress, and adaptation of the bacteria. Because biofilm systems are so diverse, a variety of new biofilm tests with features that differ in important ways from existing tests will ultimately be required. For example, the biofilm test apparatus may include a pump and a continuous flow stirred tank reactor. This report provides an overview of biofilm testing and suggests a strategy for creating standard test methods.

scholarly journals Application of NIR technology in the animal food industry

2011 ◽  
Vol 27 (4) ◽  
pp. 1811-1817 ◽  
Author(s):  
M. Maslovaric ◽  
R. Jovanovic ◽  
S. Jankovic ◽  
J. Levic ◽  
N. Tolimir
Keyword(s):  
Laboratory Testing ◽  
Food Industry ◽  
Nutritional Value ◽  
Calibration Procedure ◽  
Calibration Model ◽  
Standard Laboratory ◽  
Crude Fibre ◽  
Laboratory Methods ◽  
Animal Food ◽  
Soybean Cake

The importance of NIR technology in the animal food industry is presented in this study. As the example of the calibration procedure of NIR devices a calibration model for 14 samples of soybean cake was designed. Samples were previously analyzed in the standard laboratory testing of the moisture content, content of crude proteins, crude fats and crude fibre. In this calibration procedure high determination coefficients - R2 were established for these parameters of the nutritional value of food (0.9783 for moisture, 0.9904 for crude proteins, 0.9872 for crude fats and 0.9351 for crude fibre). The comparison of values obtained by using standard laboratory methods with values obtained by NIR technology/method indicates that by using NIR devices it is possible to obtain highly reliable results, and therefore it can be used successfully in facilities for production of animal food in the control of the quality and projection of mixtures.

scholarly journals Estimation of the presence of small dense lipoprotein cholesterol in acute ischemic stroke

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Yasuhiro Manabe ◽  
Ryuta Morihara ◽  
Kosuke Matsuzono ◽  
Yumiko Nakano ◽  
Yoshiaki Takahashi ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Acute Ischemic Stroke ◽  
Poor Prognosis ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Standard Laboratory ◽  
Laboratory Methods ◽  
Established Risk Factor ◽  
The One ◽  
Lipid Parameters

Small dense low-density lipoprotein (sdLDL) is an established risk factor in ischemic heart disease. However, its clinical significance in acute ischemic stroke (AIS) is uncertain. This study evaluates the prognostic value of the presence of sdLDL in patients with AIS by determining whether it contributes to clinical outcome or not. We studied 530 consecutive patients admitted within the first 48 hours after onset of ischemic stroke and 50 corresponding controls. Serum lipid parameters were measured on admission by standard laboratory methods. The percentage of AIS patients with sdLDL was significantly higher than the one of matched controls with sdLDL. Concerning comparisons between AIS patients with or without sdLDL, the percentages of males and patients with histories of smoking, hypertension, and cardiovascular disease were significantly higher in AIS patients with sdLDL. Concerning the grade of severity, modified Rankin Scale (mRS) on discharge was significantly higher in AIS patients with sdLDL. On logistic regression analysis, age (OR=2.29, P3). Our study showed that the presence of sdLDL might be independently associated with a poor prognosis after AIS.

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